72132811 has 4 divisors (see below), whose sum is σ = 72564912. Its totient is φ = 71700712.

The previous prime is 72132787. The next prime is 72132847. The reversal of 72132811 is 11823127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11823127 = 23 ⋅514049.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72132811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72132871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215800 + ... + 216133.

It is an arithmetic number, because the mean of its divisors is an integer number (18141228).

Almost surely, 2^72132811 is an apocalyptic number.

72132811 is a deficient number, since it is larger than the sum of its proper divisors (432101).

72132811 is a wasteful number, since it uses less digits than its factorization.

72132811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432100.

The product of its digits is 672, while the sum is 25.

The square root of 72132811 is about 8493.1037318521. The cubic root of 72132811 is about 416.2724019482.

Adding to 72132811 its reverse (11823127), we get a palindrome (83955938).

The spelling of 72132811 in words is "seventy-two million, one hundred thirty-two thousand, eight hundred eleven".